That image was of a young woman, barefoot and clad only in her shift, stumbling at dawn through the rubble left by the Great Fire of 1666 (and yes, I am counting down to the 350th anniversary of the Great Fire! See counter to the right!)
And, of course, I needed her to run into Lucy, so that my intrepid chambermaid-turned-printer's apprentice would have a reason to be involved in the mystery that follows.
But it took me a while to figure out exactly where this encounter could reasonably occur.
I thought at first the woman could be found on London Bridge. And I really wanted to write something about how the impaled heads of traitors, which lined either side of the Bridge, had caught fire. After all, in Annus Mirabilis Dryden had described in macabre detail how sparks had scorched the heads:
"The ghosts of traitors from the Bridge descend,
With bold fanatic spectres to rejoice;
About the fire into a dance they bend
And sing their sabbath notes with feeble voice."
So I realized that, first, I needed to think through what Lucy was doing out of Master Aubrey's house, just before dawn. Not too hard to figure out actually. She needed to be delivering books.
But then the question became, in what direction did she need to travel to deliver those books? Most people were living to the west of where the Fire had stopped. So why would she be going into the wasteland at all? To figure out this challenge, I began to systematically create a large scale map of Lucy's London using photocopies of reconstructed maps of the period.
The River Fleet? This was not a river I knew anything about. A vague recollection that the Romans had used the river to transport goods, but I couldn't remember ever hearing about it otherwise.
I became even more curious when I saw that several bridges, including the Fleet Bridge and Holborn Bridge, crossed it. Clearly, the river was wide enough or significant enough to require actual bridges, so it couldn't just be a stream.
Intrigued, I began to read more about this mysterious river. From the maps I could see that the river flowed from the north, went through the Smithfield butcher markets, traversed Fleet Street, and emptied into the Thames. There was also a region that surrounded it, awesomely called "Fleet Ditch." [Sidenote: I really wanted my book to be called "Murder at Fleet Ditch," but that title didn't even make it past my editor. A little too stark, I guess.]
And because the Holborn Bridge was still in place after the Fire, with the unburnt area and markets on one side, and the burnt out area on the other, it became the perfect place for Lucy to encounter this desperate woman.
The answer is, yes, of course, but it was finally bricked over in the 1730s, after being declared a public menace.
It was still problematic though, particularly in the 19th century, when a great explosion occurred as a result of the expanding gasses in the pipes below the streets. Raw sewage apparently spilled everywhere!!! (Don't even think I wouldn't use that awesome detail if I ever set a book in 19th century London. But I doubt it would make it to the cover!)
And if you want to know more, here is a nice overview of the history of the River Fleet in all its--ahem--glory.